<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>P81 【例 4-5】demo05.html</title>
</head>

<body>
    <script>
        var i = 26;
        function fn1() {
            var i = 24;
            function fn2() {
                function fn3() {
                    console.log(i);
                }
                fn3();
            }
            fn2();
        }
        fn1();
    </script>
    <a href="../首页/page04.html">
        <h2>返回上一页面</h2>
    </a>
</body>

</html>